IONICS
·
2018
·Vol. 25
·期 2
·727-735
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IF 2.347
Feng Aihu,Yu Yang,Mi Le,Yu Yun,Song Lixin
In this work, the MXene Ti 3 C 2 with excellent electrical conductivity is obtained by etching Ti 3 AlC 2 with NH 4 HF 2 solution. The electrosorption performance, the electrochemical and physicochemical properties of as-prepared Ti 3 C 2 are characterized. The results demonstrate that NH 4 HF 2 -etched Ti 3 C 2 possesses the better intercalation pseudo-capacity and the specific capacitance is up to 78 F∙g −1 , which is an increase of 34% than HF-etched Ti 3 C 2 . In addition, the desalination capacity of NH 4 HF 2 -etched Ti 3 C 2 enhances 35.5% than that of HF-etched Ti 3 C 2 . When the initial conductivity of NaCl is ~ 1000 μS/cm, the desalination capacity of NH 4 HF 2 -etched Ti 2 C 3 electrode is 12.1 mg∙g −1 , and the pseudo-first-order model can well describe the electrosorption kinetics of NH 4 HF 2 -etched Ti 3 C 2 electrode. Furthermore, the regeneration performance of the NH 4 HF 2 -etched Ti 3 C 2 electrode is excellent. This study indicates a new kind of effective electrode material to improve the desalination performance of capacitive deionization (CDI) technology.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Wei Qiang,Xiao Qu,Chuntao Chen,Lei Zhang,Dongping Sun
As a photocatalyst , titanium dioxide (TiO 2 ) suffers from the wide band gap and the quick carrier recombination process, thus leading to the inefficient use of solar energy and poor catalytic performance. Herein, in this work, TiO 2 /Ti 3 C 2 heterojunctions are designed to overcome these shortcomings via growing TiO 2 in situ on the titanium element of Ti 3 C 2 MXene . The TiO 2 /Ti 3 C 2 heterojunctions not only broaden the range of light absorption , but also hugely extend the lifetime of photogenerated carriers. Besides, the anatase TiO 2 with exposed (001) facets further enhances the catalytic properties. After optimizing the amount of TiO 2 /Ti 3 C 2 heterojunctions by controlling reaction time, 20 mg catalysts can degrade 97.6% of 30 mL tetracycline solution (15 mg/L) in 90 min under visible light . Even after five cycles, the degradation ability of TiO 2 /Ti 3 C 2 only changes from 97.6% to 94.3%. This paper offers another perspective on the synthesis of efficient and stable photocatalysts.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 38
·5440-5451
·
IF 2.6
Xiaoyun Ye,Hangyu Zhong,Yumei Zhang,Xuehua Liu,Wei Tian,Li-An Ma,Qianting Wang
Previous studies on photocatalytic technology have shown that doping co-catalysts and constructing composite heterojunctions are effective strategies for improving the photocatalyst performance. The Ti3C2/SrTiO3/g-C3N4 composite photocatalyst with a gradient heterostructure was prepared by the high-temperature calcination method with Ti3C2 as the co-catalyst. The effects of g-C3N4 content on the microstructure and hydrogen evolution rate of the Ti3C2/SrTiO3/g-C3N4 composites were investigated under simulated sunlight. The results showed that the photocatalyst with 60 wt% of g-C3N4 had the optimal hydrogen evolution rate of 1733.13 μmol g−1 h−1 after simulated sunlight irradiation for 4 h, which was approximately 3.3 times higher than that of Ti3C2/SrTiO3. After four photocatalytic hydrogen evolution cycles, no significant decrease in the hydrogen evolution rate of the Ti3C2/SrTiO3/g-C3N4 composite was observed. This work may serve as a rational reference on the synergistic effect of heterostructures and cocatalysts to improve the separation effect of electron–hole pairs, thus improving the hydrogen evolution effect of the catalyst.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Ke Wei,Jiu-Xiang Yang,Fang-Yuan Bai,Yuan-Sheng Shen,Kai Liu,Jing Liu,Li-Hua Chen,Yu Li,Bao-Lian Su
Ti3C2 MXene has been extensively studied in the field of photocatalytic hydrogen production since its discovery due to the large specific surface area and adjustable surface groups. However, the weak interaction at the interface of Ti3C2-based composites leads to a high energy barrier, which is not conducive to carrier transport. Herein, we propose the construction of a sandwich Ti3C2/R-TiO2 composite photocatalyst by in situ growing rutile TiO2 (R-TiO2) nanoneedles in Ti3C2 MXene through NaOH oxidation treatment and the microwave hydrothermal method. This in situ synthesis can make Ti3C2 MXene and TiO2 nanoneedles closely link together, which is conducive to carrier transport and material stability. The best Ti3C2/R-TiO2 composite achieves an excellent hydrogen production rate of 1.62 mmol g–1 h–1, as endowed by the 2D nanosheet-constructed sandwich structure, an increased specific surface area, and improved charge carrier separation and transport.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Haohuan Yuan,Wenting Xiao,Xin Zhang,Jiao Bao,Wei Li,Bo Huang,Guannan He
Efficient carrier separation and high electron migration efficiency are essential for sustainable H 2 energy production via photocatalysis . In this work, a Mn 0.5 Cd 0.5 S/Ti 3 C 2 MXene/g-C 3 N 4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination , etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C 3 N 4 and Mn 0.5 Cd 0.5 S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti 3 C 2 MXene flakes assembled between g-C 3 N 4 nanosheets and Mn 0.5 Cd 0.5 S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g −1 h −1 , which is much higher than that of the pure g-C 3 N 4 and Mn 0.5 Cd 0.5 S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
研究领域:
材料科学
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能源化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Aihu Feng,Yun Yu,Feng Jiang,Yong Wang,Le Mi,Yang Yu,Lixin Song
MXene , a new family of 2D transition metal carbides and carbonitrides , has been proved to possess excellent electrical conductivity and hydrophilicity. In this work, a single-step method to produce the larger interplanar spacing 2D MXene Ti 3 C 2 by etching Ti 3 AlC 2 with NH 4 HF 2 was demonstrated, and the optimal reaction conditions between Ti 3 AlC 2 and NH 4 HF 2 were systematically researched. The morphology and microstructure of samples were characterized by scanning electron smicroscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD). The thermal stability of Ti 3 C 2 was investigated by the thermogravimetry (TG) and differential thermal analyzer (DTA). It was found that the lattice parameter c of obtained Ti 3 C 2 was up to 24.9 Å, and the larger interplanar spacing Ti 3 C 2 was more stable than the sample exfoliated by HF. The transition temperature in air from NH 4 HF 2 -etched Ti 3 C 2 to anatase TiO 2 thoroughly is more than 500 ℃, and the multilayered structure of Ti 3 C 2 could be well retained even afer 900 ℃ heat treatment, while the value of HF-etched Ti 3 C 2 is less than 350 ℃. This work is important for exploring a safe synthesis method and well understanding the thermal stability of 2D MXene materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 10
·期 2
·2204041
·
IF 17.521
Ningning Liu,Lanlan Yu,Baojun Liu,Fei Yu,Liqing Li,Yi Xiao,Jinhu Yang,Jie Ma
Constructing faradaic electrode with superior desalination performance is important for expanding the applications of capacitive deionization (CDI). Herein, a simple one-step alkalized treatment for in situ synthesis of 1D TiO 2 nanowires on the surface of 2D Ti 3 C 2 nanosheets, forming a Ti 3 C 2 -MXene partially derived hierarchical 1D/2D TiO 2 /Ti 3 C 2 heterostructure as the cathode electrode is reported. Cross-linked TiO 2 nanowires on the surface help avoid layer stacking while acting as the protective layer against contact of internal Ti 3 C 2 with dissolved oxygen in water. The inner Ti 3 C 2 MXene nanosheets cross over the TiO 2 nanowires can provide abundant active adsorption sites and short ion/electron diffusion pathways. . Density functional theory calculations demonstrated that Ti 3 C 2 can consecutively inject electrons into TiO 2 , indicating the high electrochemical activity of the TiO 2 /Ti 3 C 2 . Benefiting from the 1D/2D hierarchical structure and synergistic effect of TiO 2 and Ti 3 C 2 , TiO 2 /Ti 3 C 2 heterostructure presents a favorable hybrid CDI performance, with a superior desalination capacity (75.62 mg g −1 ), fast salt adsorption rate (1.3 mg g −1 min −1 ), and satisfactory cycling stability, which is better than that of most published MXene-based electrodes. This study provides a feasible partial derivative strategy for construction of a hierarchical 1D/2D heterostructure to overcome the restrictions of 2D MXene nanosheets in CDI.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xueqin Zhu,Minjian Yang,Chunnian Zheng,Qin Zhu,Zhili Cui,Piaopiao Zhang
Exploiting magnesium-based hydrogen storage materials faces great challenges due to their inherent thermodynamic and kinetic characteristics. However, this issue can be mitigated by employing a catalyst doping modification strategy. In this work, a composite of titanium carbide (Ti 3 C 2 T x MXene)-supported nickel fluoride (NiF 2 ) nanoparticles, known as NiF 2 @Ti 3 C 2 , was fabricated via the hydrothermal approach and utilized to reinforce the hydrogen storage performance of magnesium (Mg). It was shown that NiF 2 @Ti 3 C 2 composites have exceptional catalytic properties for Mg hydrogen storage. The Mg–NiF 2 @Ti 3 C 2 composite, containing 5 wt% of NiF 2 @Ti 3 C 2 , released 3.46 wt% of hydrogen at 300 °C, while pure Mg produced essentially little hydrogen in identical conditions. Additionally, there was a decrease in the activation energy of hydrogen desorption from 135.4 to 77.65 kJ mol −1 . Moreover, the composite offered excellent stability and reversible performance, achieving 95.8% capacity retention after 10 consecutive testing cycles. During the hydrogen uptake and release process, the NiF 2 @Ti 3 C 2 composite interacted with Mg/MgH 2 to produce the metals Ti 0 , MgF 2 , and Mg 2 Ni/Mg 2 NiH 4 , which acted as active species to boost the hydrogen storage performance of Mg.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 5
·630
·
IF 4.7
Xiang Li,Qiao Xu
In this work, the EVOH/Ti3C2composite fibers were prepared via electrospinning and the effect of added Ti3C2on the structure and properties of electrospun EVOH fibrous membranes was further investigated. The morphology, crystal structure, thermal properties, wettability, tensile properties, as well as air permeability and water vapor permeability of as-prepared EVOH/Ti3C2composite fibers were studied. The Ti3C2is uniformly loaded onto the surface and inside the composite fiber and affects the fiber diameters. Furthermore, The Ti3C2self-orients along the fiber axis and does not change the crystal structure of the electrospun EVOH fibers, improving the crystallinity and thermal stability of the electrospun EVOH/Ti3C2fibrous membranes. With the increase in the Ti3C2concentration in the electrospinning polymer solution, the addition of Ti3C2not only rapidly improves the wettability of the fibrous membranes, but also enhances their air permeability, compared with the pristine electrospun EVOH fibrous membranes. The experimental results provide theoretical guidance for the preparation of Ti3C2composite fibers, and also expand the application of electrospun EVOH and EVOH/Ti3C2fibrous membranes.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Guichen Song,Qihuang Deng,Bo Wang,Zhiduo Liu,Chen Ye,Xianzhe Wei,Dan Dai,Zhongbin Pan,Wei Li,Shulin Song,Li Fu,Cheng-Te Lin,Nan Jiang,Jinhong Yu
In virtue of its excellent performance and abundant surface terminations, MXenes, a newly emerged 2D materials , greatly exhibit promising applications in many fields of energy storage and electromagnetic shielding. Ti 3 C 2 , a member of MXenes, is widely investigated in recent years. However, lack for attention in thermal property and corrosion behavior. Here, Copper matrix composites were prepared by Spark Plasma Sintering , in which TiC and few-layer Ti 3 C 2 nanosheets as filler. The results exhibit corrosion resistance of the Ti 3 C 2 /Cu composites were improved compared to TiC/Cu composites, benefiting from outstanding electrical conductivity and easily oxidized property of Ti 3 C 2 . However, the thermal conductivity of Ti 3 C 2 /Cu composite with the content of 2 wt% Ti 3 C 2 improves about 15% compared to TiC/Cu composites with same content, resulting from the low inherent thermal conductivity of filler and lattice mismatch between copper and filler. Moreover, the electrical resistance of Ti 3 C 2 /Cu composites increases about 100% with the content of 2 wt% Ti 3 C 2 at interfacial contact resistance measurement compared with pure Cu. Meanwhile, the anti-corrosion performance of the Ti 3 C 2 /Cu composites was improved over pure Cu. This work will broaden appliance field of Ti 3 C 2 and lay the foundation for the future research.
研究领域:
材料科学
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能源与环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiu-Xiang Yang,Wen-Bei Yu,Chao-Fan Li,Wen-Da Dong,Li-Qi Jiang,Na Zhou,Zhi-Peng Zhuang,Jing Liu,Zhi-Yi Hu,Heng Zhao,Yu Li,Lihua Chen,Jinguang Hu,Bao-Lian Su
Increasing the separation efficiency of photogenerated carriers and preventing the hydrogen back oxidation are two key challenges in photocatalytic hydrogen production. Herein, we report a promising PtO@Ti 3 C 2 /TiO 2 photocatalyst to overcome these two challenges by in-situ growing TiO 2 nanosheets on Ti 3 C 2 MXene (to improve charge separation) and depositing PtO nanodots (to diminish hydrogen back reaction) for enhanced photocatalytic hydrogen production. Within this design principle, the photogenerated electrons and holes in the PtO@Ti 3 C 2 /TiO 2 composites flow in opposite direction into PtO and Ti 3 C 2 respectively, resulting in effective separation of the photogenerated electrons and holes. Beyond, the higher oxidation state of PtO nanodots also largely suppresses the undesirable hydrogen back oxidation reaction. Thereby the PtO@Ti 3 C 2 /TiO 2 composite demonstrates remarkable hydrogen production efficiency. Our work here indicates that rational design of dual co-catalysts could not only promote the separation of photogenerated carriers for enhanced hydrogen production, but also inhibit the reverse reaction of hydrogen production.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·655
·
IF 3.4
Yuxin Bai,Shasha Xu,Jing Chen,Xun Sun,Shan Zhao,Jingcai Chang,Zuoli He
Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4and TiO2and Schottky barrier presented among TiO2and Ti3C2suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F−here).Keywords:Ti3C2;g-C3N4;heterojunction;photocatalyst;4-chlorophenol
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）